It was not until 1978 set free from the prison.
A. that the old professor was
B. did the old professor
C. was the old professor
D. that was the old professor
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(答案→)A. that the old professor was
B. did the old professor
C. was the old professor
D. that was the old professor
解析：试题分析：句义：直到1978年那个老教授才被从监狱释放。It was ……that 构成强调句型排除B； C D语序不对，因为not until位于句首构成倒装用于强调句型不倒装。所以A正确。